我在表单上有一个dataGridView和一个按钮。当我在dataGridView1中进行任何编辑，插入或删除操作时，下面的代码很神奇

I have a dataGridView and a button on a form. When I do any editing, insertion or deletion in the dataGridView1, the code below does the magic

public partial class EditPermit : Form
{
     OleDbCommand command;
     OleDbDataAdapter da;
     private BindingSource bindingSource = null;
     private OleDbCommandBuilder oleCommandBuilder = null;
     DataTable dataTable = new DataTable();

    public EditPermit()
    {
        InitializeComponent();
    }

    private void EditPermitPermit_Load(object sender, EventArgs e)
    {
        DataBind();                           
    }

    private void btnSv_Click(object sender, EventArgs e)
    {
         dataGridView1.EndEdit(); //very important step
         da.Update(dataTable);
         MessageBox.Show("Updated");        
         DataBind(); 
    }

    private void DataBind()
    {
        dataGridView1.DataSource = null;
        dataTable.Clear();

        String connectionString = MainWindow.GetConnectionString(); //use your connection string please
        String queryString1 = "SELECT * FROM TblPermitType"; // Use your table please

        OleDbConnection connection = new OleDbConnection(connectionString);
        connection.Open();
        OleDbCommand command = connection.CreateCommand();
        command.CommandText = queryString1;
        try
        {
            da = new OleDbDataAdapter(queryString1, connection);
            oleCommandBuilder = new OleDbCommandBuilder(da);
            da.Fill(dataTable);
            bindingSource = new BindingSource { DataSource = dataTable }; 
            dataGridView1.DataSource = bindingSource;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }


    }